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headset install-fork crown race question(9 posts)

headset install-fork crown race questioneflayer
Jan 31, 2003 6:26 PM
Installing (first time) threaded headset into frame and putting fork crown race on fork steerer. This is an FSA Duron X threaded headset. Fork race is not full circle but has a split in it. When I put it on the fork it just slides on without any pressure required. Is it supposed to go on this easy? Do I need to use lock tite or something to make it secure? Or did I miss a step? Any assistance appreciated.
I think that you need a different headset.Spoke Wrench
Feb 1, 2003 5:39 AM
It sounds to me like you have a 27.0 mm crown race and you need one that measures 26.4 mm. I'm also puzzled by the split in the crown race. That doesn't sound right to me.
more questions...Spoke Wrencheflayer
Feb 1, 2003 6:18 AM
I think you could be on to something here. Does the crown race have to come from the headset manufacturer. In other words could a bike shop have a spare race that would be the correct size and would it work with the rest of the parts from this headset?
Maybe.Spoke Wrench
Feb 1, 2003 6:42 AM
It certainly is possible to buy separate crown races for 1" steerer tubes in both diameters. When I owned my own shop I kept some because it's pretty much a guess which size you need until you take the bike apart.

The question is: Will the performance of the headset be degraded by using a part of questionable compatability? My answer is I'd try it on a $30.00 headset, but not on something that is higher end. My Quality book tells me that your Duron X headset has "angular contact sealed cartridge bearings." One of the more engineering oriented guys on the board may have a different opinion, but I think that I'd want to use the right crown race with that.
Spoke-have you ever seen one of these split crown races?eflayer
Feb 1, 2003 7:20 AM
Is it possible that this part is supposed to ride loose under the bearing and I am mistaking it for the crown race? Is it possible this headset did not come with any crown race at all?
re: headset install-fork crown race questionthe other Tim
Feb 1, 2003 7:48 AM
The split crown races slide on (and off) easily. With cartridge bearings, the real purpose of the crown race is to center the steerer with the bearing.

I wouldn't use any locktite, but I would put a thin layer of grease on the steerer.
this slides on and off with just basic finger pressure...eflayer
Feb 1, 2003 7:57 AM
almost as if it might turn on the fork when headset is all tightened down and properyly adjusted. Maybe under load and properly adjusted it will be just fine. Think so?
sounds ok to methe other Tim
Feb 1, 2003 9:33 AM
As long as there is some resistance when you push it down, and it doesn't have any play when installed, it should be fine. When the HS is properly adjusted, the lower bearing actually compresses the lower race very slightly, so the only way it should slip is if the bearing is seized.

The first time I saw one of those races, I thought "what the ...", but it really is nice to be able to remove it with a pocket knife.
input appreciated. lbs says you are correct...eflayer
Feb 1, 2003 2:44 PM
with sealed bearing headset this part is considered more a bottom plate than an actual race. Just needs to go on and then headset adjust and load will allow it all to work smoothly.

Thanks again.